Antelope Horn Milkweed

Antelope Horn Milkweed

Asclepias asperula
Asclepias asperula
Milkweed, Antelope Horn, Spider Milkweed, Green-flowered Milkweed
Western U.S., northern Mexico

12 inches

3 feet
  • Central Texas
  • Texas
  • Full Sun
  • Part Sun/Shade
  • Very Low
  • Deer Resistant
  • Flowering
  • Attracts Pollinators

About This Plant

Sun or partial sun. A clump-forming deciduous perennial, up to 24 inches. Big flowerheads appear throughout the warm season, followed by green seed follicles that curve as they lengthen hence the common name: antelope horns. The thick leaves are long, narrow and folded lengthwise, somewhat resembling their close relative, tropical milkweed.

A roadside weed in the Blackland Prairie and Edwards Plateau, this species is becoming harder to find due to local development and roadside mowing. Milkweeds are the only food source for monarch butterfly caterpillars.

Although robust, antelope horn is difficult to propagate in a greenhouse setting, so it’s uncommon at commercial nurseries; preserve it if you have it on-site.


None required, beyond the care needed to establish it in its preferred setting — weedy roadsides and inferno strips. Aphids are likely to infest any milkweed, but they aren’t really a problem. They can be sprayed off with soapy water. Treating aphids will (obviously) wipe out the monarch caterpillars too.


Plant Type:
6-12" H, 1-3' W
Sunlight Requirements:
Full Sun, Part Sun/Shade
Soil Types:
Clay, Sandy, Thin
Bees, Butterflies, Butterfly Larvae, Pollinators
Flower Color:
Cream, Green, White
Bloom Time:
May, June, July, August, September, October
Freeze Hardy:
Coupon Eligible:

This plant goes well with

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